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BeamCal

BeamCal. W. Lohmann, DESY. BeamCal: ensures hermeticity of the detector to smallest polar angles -important for searches Serves as a feedback system for Lumi-optimisation and beam diagnostics (see Bill’s talk) -supports maximum Luminosity. Current design (Example LDC, 14 mrad):. LumiCal

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BeamCal

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  1. BeamCal W. Lohmann, DESY BeamCal: ensures hermeticity of the detector to smallest polar angles -important for searches Serves as a feedback system for Lumi-optimisation and beam diagnostics (see Bill’s talk) -supports maximum Luminosity SLAC

  2. Current design (Example LDC, 14 mrad): LumiCal (Luminometer) QD0 TPC HCAL ECAL BeamCal -compact, approach smallest possible Moliere radius, e.g. Si/W sampling calorimeters -centered around the outgoing beampipe (detector phi symmetry broken) -readout after each BX (more space for electronics, power dissipation) SLAC

  3. Simulations to optimise the Design E.g. from UC Boulder Beamstrahlung TeV per BX electron from 2γ process Side view Head-on view Efficient detection of high energy electrons is essential for search experiments SLAC

  4. Forward Region in the LDC Detector SLAC

  5. Forward Region BeamCal Space for cables QD0 LumiCal Vacuum Pump Space for electronics/connectors cooling Graphite Shielding Tube SLAC

  6. BeamCal Details Prototyping of 12 channel Integrated FE (amplifier and ADC) SLAC Made by S. Schuwalow

  7. Tungsten Layers and Sensors SLAC

  8. Front/Back Support Frames SLAC

  9. Total mass: ~200 kg SLAC

  10. BeamCal positioning inside the Shielding Tube SLAC

  11. The Mounting Procedure for BeamCal Installation and disassembly must be possible without opening the vacuum! 1 montage of an auxiliary structure 2 montage of the first half barrel 3 Turn the barrel and bring the first calorimeter half barrel in final position 4 remove the auxiliary structure 5 montage of the second half barrel To perform this procedure the upper half of the shielding tube has to be removed SLAC

  12. Summary BeamCal (example LDC) - Length in z: 15 cm bare calorimeter ~10 cm graphite in front (reduction of backscattered electrons). ~10 cm space at the rare side (electronics, connectors) - Inner and outer instrumented radius: 20 – 165 mm - Full outer Radius: 200 mm - Outer radius including support: 220 mm - Total weight: ~200 kg - Upper part of the shielding tube must be removable - Crane operation necessary for montage/demontage -Details of FE ASICs not yet fixed, but there will be connectors, power and signal cables……. SLAC

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